fix: skip /etc/passwd check on Windows in security test (#363)

Fixes #362

The test TestCleanupMergeArtifacts_CommandInjectionPrevention was failing on Windows because it checks for /etc/passwd, which is a Unix-specific file that doesn't exist on Windows.

Added runtime.GOOS check to skip the /etc/passwd verification on Windows while maintaining the security check on Unix systems.

cmd/bd/merge_security_test.go

@@ -3,6 +3,7 @@ package main
 import (
 	"os"
 	"path/filepath"
+	"runtime"
 	"testing"
 )
 
@@ -110,9 +111,12 @@ func TestCleanupMergeArtifacts_CommandInjectionPrevention(t *testing.T) {
 			// exec.Command safely handled the filename.
 
 			// Verify that sensitive paths are NOT affected
+			// Note: /etc/passwd only exists on Unix systems, so skip this check on Windows
+			if runtime.GOOS != "windows" {
 				if _, err := os.Stat("/etc/passwd"); err != nil {
 					t.Errorf("Command injection may have occurred - /etc/passwd missing")
 				}
+			}
 		})
 	}
 }